<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<style>
th,td{padding:0;}
table{border-collapse:collapse;}
th,td{border:1px solid #000;}
</style>
<body>
<table>
  <tr>
    <th>标题1</th>
    <th>标题2</th>
    <th>标题3</th>
    <th>标题4</th>
    <th>标题5</th>
  </tr>
  <tr>
    <td>单元格1</td>
    <td>单元格2</td>
    <td>单元格3</td>
    <td>单元格4</td>
    <td>单元格5</td>
  </tr>
  <tr>
    <td colspan="2" rowspan="3">单元格1</td>
    <td>单元格3</td>
    <td>单元格4</td>
    <td>单元格5</td>
  </tr>
  <tr>
    <td colspan="2">单元格3</td>
    <td>单元格5</td>
  </tr>
  <tr>
    <td>单元格3</td>
    <td>单元格4</td>
    <td>单元格5</td>
  </tr>
</th>
</table>
</body>
</html>
